What counts as a plateau

Weight isn't linear. Even on Mounjaro at full effective doses, your weight bounces 1–2 kg week-to-week from water, sodium, hormones, glycogen and what's currently in your bowel. None of that is fat changing.

A genuine plateau is roughly defined as 3–4+ weeks without any downward trend on a 7-day rolling average. If you're seeing weeks where you go up before going down, you're not plateaued — you're seeing normal variation.

Why plateaus happen on GLP-1s

Three main reasons:

1. Metabolic adaptation. As you lose weight, your basal metabolic rate falls because there's less body mass to maintain. A 100kg person burns more at rest than the same person at 85kg. The same daily intake that produced 1kg/week loss six months ago now produces little or none.

2. Dose still rising. Many patients plateau mid-titration. Mounjaro titrates from 2.5mg to 15mg over several months. Wegovy from 0.25mg to 2.4mg. A plateau at 7.5mg of Mounjaro often breaks at 10mg.

3. Lifestyle drift. Small changes in food choices, portion sizes, alcohol intake, exercise consistency and sleep accumulate quietly. You don't notice them — but the scale does.

The dose question

The first question to ask: are you on your maximum effective dose?

• If your dose is mid-titration and the plateau has lasted 4+ weeks, increasing dose is usually the right move
• If you're at the maximum dose for your medication, dose adjustment isn't an option — lifestyle is
• If you experienced side effects that stopped you titrating up, talk to your prescriber about whether dose retitration is appropriate

At Preston Clinic, dose adjustment is part of monthly reviews. If a dose increase is appropriate, we can adjust your prescription same week.

Lifestyle factors that stall progress

Protein intake too low

If you're losing weight quickly without adequate protein, you're losing muscle alongside fat. Less muscle means lower metabolism means slower loss. Target 1.2–1.6g of protein per kg of your target weight daily — usually 80–120g for adults.

Alcohol creep

One or two drinks at the weekend used to be fine. Now it's most evenings, and the calories add up. Track for a week honestly — you might be surprised.

Snacks edging back in

GLP-1s blunt hunger early in the day but appetite often returns in the evening. Late-night grazing on the sofa can erase a tight day's eating in 30 minutes.

Exercise dropping off

People often exercise enthusiastically when weight is dropping. When it stalls, motivation drops. Sustained resistance training is one of the single biggest non-medication levers for breaking plateaus.

Sleep

Less than 7 hours regularly disrupts hormones (ghrelin, leptin, cortisol) that govern appetite and fat storage. Patients sleeping 5–6 hours often plateau even when food is dialled in.

What to actually do

A practical sequence:

1. Wait two weeks. Confirm it's a real plateau, not a fluctuation. Take measurements (waist, chest, hips) alongside the scale.
2. Audit honestly. Track food and drink for 7 days. Be specific. Most plateaus break here.
3. Hit your protein target. If you're not at 1.2–1.6g/kg, that's the first lever.
4. Add resistance training. 2–3 sessions weekly. Compound movements — squats, deadlifts, pressing, rowing. Bodyweight is fine to start.
5. Review your dose. If you're mid-titration, a step up usually helps. Book a consultation.
6. Consider switching. If you've maxed one medication and lifestyle is dialled in, switching from Wegovy to Mounjaro or vice versa sometimes restarts loss.

When the plateau is the right answer

Not every plateau needs solving. If:

• You're at or near a healthy BMI
• You feel good, energy is stable, sleep is fine
• Body composition keeps improving (waist down, clothes looser) even if the scale doesn't move
• You can sustain your current approach long-term

...then you might be in maintenance, not a plateau. The goal becomes holding rather than losing further. That's a success, not a problem.

Body composition matters more than the scale

If you're building muscle and losing fat at similar rates, the scale won't move — but you're absolutely making progress. Signs to watch for:

• Waist measurement dropping
• Clothes looser despite same scale weight
• Strength and endurance improving
• Body fat percentage falling (if you have a way to measure)

Many plateaus on the scale aren't plateaus in actual progress.

When to consider stopping

If you've reached your goal, the plateau is sustainable, and lifestyle is working independently of the medication, you can discuss tapering with your prescriber. Most patients benefit from continuing maintenance doses indefinitely — but some are good candidates for stepping down.

The wrong move is stopping abruptly because the scale stalled. Appetite returns quickly and most patients regain weight rapidly.

Book a consultation

Plateaus respond best to a calm, informed reassessment — not panic adjustments. Every Preston Clinic monthly review includes plateau troubleshooting if needed, plus dose adjustment where appropriate. Book online or walk in to Frenchwood Pharmacy on Ruskin Street — free initial consultation.